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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0563ed8597b11b959db6d2f02d70cf16b40f08d909153435230208201cebf154' 
  AND token = 'H6WVh3vD2nVHD0wIALzJWFHg9kVylhtc2lioi4FgYrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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