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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31fd7a89268c30eec86cba028f8de61791aedd108e8c2d8bc5139c6b402f7db6' 
  AND token = '7ZHHEtnWODNtZywS/qQDYxNadxX7NYXsd/h7hV01K3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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