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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a94e91279931c07081dc1b72ad18c9d723014b38e3bf9aeeb19a9aa68cc102' 
  AND token = 'mJcl2L+54/Ha53duEH4mBRAWgGD6DKOVDUzHC9FKt1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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