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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38c5048dd336392a1a89f8be2c18a31266363c957cd2a79e9bba22a035d3487' 
  AND token = 'ENeAHwSU0fXEadzfQ4h46iIL0/dm1UfbrZQLRbQIIFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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