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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58fd1782ed4499f212407928a2ff8b593bddb97024e6a0b6698bff762e401246' 
  AND token = 'L1iO0Lx3D6MxzlzAN97pXC10h2kq6wjViMCF4WKvMzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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