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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036e705f167d9b9181e5f51bcd3fbfada47733f8fa4a9e766010b6cd6880ceb7' 
  AND token = 'tXY/mb2RbHQF69MTF12r/tE1s5lgakBUq9UVy5+hoQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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