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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966c63fe90bc004785b4b44209cf0a04fdd867d0db8f6c53365065ccb53e6a25' 
  AND token = 'JoKjb0eDIDbTekIZl0kL3leYRjY9m0PCGrettRfQQgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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