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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab38d267531a80d150abe56d8ada16703eb2c9bb0400c268d39e610005e3036' 
  AND token = 'UnWYawnIjVPEdrQa5dHv+93DzmwP+EYK2q+y3vZR+2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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