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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3beca789e5de1da2e7acbc379575b55da2f7e804904de3fe3a2f3a6cb5f6f1' 
  AND token = '8+z06lcQpC32F3VhNYMFtatncb6ej+MuAr1aB43rOPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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