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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a7762bc8914e14f7ee0b9e17cef654094dc43b75a4eb651119334f17d36b2d' 
  AND token = '+gFkV4DQ6oJrWJm1BaiMT/1PKdHDYqBJ02tkbT7K45U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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