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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8c6f32234f9953404549433a04701c0863e2ca2529d44c6085ddf6673d66aa' 
  AND token = 'hV3ktbwPWABb26pH3MLP6NWSLsFsU8kRF1rG8R1nI44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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