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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c522995b691a12a80ad20afdc7f399eaa220e29a67e6c6224071fa253baae734' 
  AND token = 'xcl+cF+imtYkJitXFkNk9Y6LQ5ITGF87c8lHa3CeBHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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