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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e79b5392f8b57e31cad80d6e41256464f49b4628f58e4fbe35ded52f849c9c6' 
  AND token = 'X9uNTRcJS3rdD+Di6uQ/abY9GYLcVzvqE5Yfr81snCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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