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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980d2c20d330724db71805eaae8f50065e80989796e8c7fac9d62ccebed5d932' 
  AND token = 'il3FItt37eshJmB+5tYu2pif9B6oTRpaamnLx1zugbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}