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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd03189ff8c0c928153a1fe8d7f02021c1773eb2d72b61280555737d1862baeb' 
  AND token = 'tv7T6MMI6CQeoh5douctOmwwRmv5TKA1n07PZc1242g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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