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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab10efd20686ac32a249b4b7713d4f6ae3794f1a0796663512969448cab324c3' 
  AND token = 'bnH3CCorEKxFV8zKXG2yS4yjwAPBblG+LuP2dqLy0Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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