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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672ab95281feaec6c940f2e7c16ef95688c6de2b0ce08ac1948bf89366befedc' 
  AND token = 'BFY1JlRwJ1NoTznGlKoFknpwS6xWPBVtctK9yzHky0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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