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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa7c4cb9e5ab3f7aa81e3327c8975f33aa7fee60b3940556805e9107b83d2b2' 
  AND token = 'SVLsx/SWmudrN1ZpOtE95mIZHgw5/8a+AQNl8NYZvxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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