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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f175caaa24c3ccb31b1a23285b763083f6a497e00b0e0a3082024f68cc6c4504' 
  AND token = 'K2tLxwAGQCZq9/MI+m0E30MSY5tfVSnvIj+ufEEwvAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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