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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb73deb2dc1aad6060a63eca57414dcc31eab799c2efe1dc4ecc0f8198ceb22a' 
  AND token = 'TEV8NmDdJgNoCB/jjqiGgk+rSJcXbYNQoaunbePw0tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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