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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce4ffefa827626af2609f66606242606e622d36f0942cc6469fb45449bf61fb' 
  AND token = 'FFCU1lswO40wAhEkE/koWBFBkIRhZaQCTp/ovQ1sNCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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