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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1194967d352efcddb2650473b81d3f5307c582d13243dd1e9b9afed8682e84a8' 
  AND token = 'dp7ed6XaCwM7ulrGno4Mdrtw9zevK8SbhxzckS5Jo5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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