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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d76f8b8b1332e1ae2d9cff90d68f33edf59041571f42f255c2e1209e94ca2e' 
  AND token = '/lm1ql4dJ4TnY2795cROqWPRnRPGmFFvq/U1j2CK76c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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