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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2292ebf53019b81ec0ab01dd66757c139d2c3d66979e0b51aeacfd13a1057ada' 
  AND token = 'f+A80K21tt9svsGM2cgEYfEi9wxtdU4f6hb6bZ8N13w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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