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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c77e257abd84074fddff7129ebdd8bb9e1fbcf64cbac4db6ea88993d179e62' 
  AND token = '4ryFAzvmg9Lde5fY2U87YF9ldN3zK7buA2Y9MBTnnGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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