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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38f6f4294b1c11e989967b4ab8e7cd2e719cb27a3b9490b4c236616fbc8fd53' 
  AND token = '/YX86JU2VMfJ04l8H4BMEcZt2qGZqlxNE75J3rRShIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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