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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c51e3a8b718f7ff1ec6b55b12112783465abefa28f60d91dc053ebedc5ec012f' 
  AND token = 'lHXLfjHNMK1J8Xy5Pl8u6+rQBRAWiEGuoqv91l/gs6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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