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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ae86b62fa3f06b60302c6ec04c4d5f8694f56e4b5f0f87c328dbe9370c72e1' 
  AND token = 'Pp9X9O/os/Nx/MplmHK4JcvYv08F58MzPhL5+X4J51Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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