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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a3ac5c3b874bb58fe9a2e70a7d3902c11328eb9cb12e3ff51364d2efa8836c5' 
  AND token = 'kx9AZn4dWdHUmDaM2TlaBG/SBJMfv6qhlD/C7WqnbyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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