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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85bd1b7b50f6d3c656fcddbccd5d5f2a12266750fd25761909530ed90805ae3' 
  AND token = '+PV6O4bUtvxwt07AS5w/bwheobiFK0AX8AJtrmEOQLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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