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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea37cd5d1309e0ac1643b69a0cec56ef08d2271c1e2860311cc0fbe42f79922' 
  AND token = 'o+8X/JnRfiJ3iCCFavHxVvrufkf8/f+d0Tqx0opcBRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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