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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abb205b9dbbcc0d969b2be10d9bba1ecb87284945128bbdaea5773b57939b0c' 
  AND token = '56Q7iEWc2FsDqwP7I60+R90GJLqsnSkCDqb+R+Khsj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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