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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f41b570440b658e28ae824f26b12321c0a01d7a30c58a7b0e9c701a1a9d14c' 
  AND token = 'iSBVqDguZ3sRjTz4RWCt9V9OXDLWM6kwTe5CM+fmm1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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