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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510b764810ce6ee56e85fe59944466628da1612bc15ad064abf1112428056f74' 
  AND token = 'invzPrI5pYLWlrh7IMlv8Ujc9ksaibyV6iOV0rrT7Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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