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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa841e6154945f1549913e109803b60280d0c9eddcbfcc67827c1d1f2ddeed5' 
  AND token = 'Vw2NAkVfKHZQttZ7ftzq1HOVOg0oSavLCyWF/rPqOlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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