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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3379d37836e32cbea174ad99796e635527f88fe164ea446572852f069517517' 
  AND token = 'xLC1MJ0guYICl0rSw5Rr0wkFD6sE9i7BiNFVg24/5o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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