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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53da03d1e9dd3cfa2af8f06ee521c32abf193a1002148c3a1482e5dff0102e75' 
  AND token = '4LPWNVh12uXuvMKeKrAKS0yV3B/1fPKPlRpqZ1tSK2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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