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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238918deeedf0408bf19ee6b33e42aaa5f5d6cad7cc6a4866e1b3f22768572e0' 
  AND token = 'Uo/jvASbio52ieHk3vP4lhbC/1YUsL8lBEOYHCIWtLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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