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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '981f17c39fc462d450a517a929e1fe2225d3650e00956090ada2bd16fafa2849' 
  AND token = 'OrP5uIyhPjSj4YQsoa6TTd5HhCNaXhiVednEFiU7hEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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