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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00bbd1bc594071d0ecef617c250329a6be83bdb18ca8f5a4771d2c9369b284aa' 
  AND token = 'qwcYuJVo01bG+H2/oQ6IQxR13gP0FidXk0bXwAL8oAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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