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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01eaab4ba2507d6c6cbdc4e450776cda924266284529fdf70bf0f295b48db802' 
  AND token = 'g/jRWkft99klVBPh/R44O0kz+IC1dLVwkKxav7zL28k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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