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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b145401dccdab752bf4c86f566fab6d4dd5664533cd0b8f063e6a961eb72cb' 
  AND token = 'qBUpCt1brLxxAPfzcpSZfphr4dO4KlySHuYhb+6jxZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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