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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301d03a86e4f0ddbbece90d89ad5ddeff7d082cd2ee862331381a96e3559fe53' 
  AND token = 'TOI7+Dovsih9gHJ+4iDa3Yq5QTC2g/Wb9SKdGt0ewBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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