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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1212bf0051ef5ac91c98ea81e7f5f0a806b76b3fe791ccd7c5fa58a69fa1cfdf' 
  AND token = '3Pd5sL9rSKshD0ukvz1rcSeI6vBJ/5SH03bU02nX3H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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