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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd887271af8c36ea7b409cd43fb2631742f5526223942ebeff110e3e0b4998a7e' 
  AND token = 'nPWUbEs8wIZtx6e+shs5jvPULWtGX76Oe3taqUyeMGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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