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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57d3671dee7674b8d1c5f1ed99025b19c4bb4b448251c26be07e51a1ee7becc' 
  AND token = 'Rmu0MZ4ty4eGsSkQeAKECrBWcJ8VjfINk5PfMNpgmHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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