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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c9982df73b8e838da94d2db089d86859ac66ead736487d9655c68d3a0f4f62' 
  AND token = 'OCU0wcHRBb9Jdi5SP75kbXsgQF4vDiEg/8Fv/Q+Nxjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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