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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fcc5112423853232d3c03076868a23c209f20e50ed6c121b1e57894b1b3eaa' 
  AND token = 'VCKa8UqtXb/Tu8QbwCVXAcA7V6+IRX+MnPATSFHMXow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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