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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8603ae2be4489c87e1228c0e7da7fe04085387957eb0d34bcec5384e160546e' 
  AND token = 'R5SS19QLiRAxKGv61m/Ok6bMVBhLg+K66My/VcnNuk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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