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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec59321188a4a9e5a32c99eeafdc05bbc9195585a8a8435b1fe5f34d724e6aea' 
  AND token = 'KhqkvPXgD2V3KCGLmEN8CHEkzUANrD8wxTv1u0QpjbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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