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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabfb44ce7774220a3046efd296446b7fa405723d062837dcdd00b7cb3234d9e' 
  AND token = '3CA4fACoVhF5x3Pl3DjVF0b0pjuMy3C50uRJiBt9lus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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